Hi George,
I think you are correct,
power supply needs upsizing,
2 jobs I have done to date,
found best to oversize by 10-20% of
the max current per drive x number of drives,
we have 4x 6 amp motors, power supply is 30 amp,
this help when braking heavy loads as power ploughed back in
on deceleration has somewhere to be absorbed,
some good info on the Gecko site.
Great machine/idea
regards
peter